Question

Where do I register spns to ?

Asked by: jazzcatone

I have a new web application that has been set up on a new Windows 2003 server that was provided to us. Currently the client is trying to authenticate with Kerberos but cannot. In the event viewer the on the hosting server the error 0x7  KDC_ERR_S_PRINCIPAL_UNKNOWN shows:

Event Type:       Error
Event Source:    Kerberos
Event Category: None
Event ID:           3
Date:                12/2/2008
Time:                10:26:50 AM
User:                N/A
Computer:         OHCLEIIS102C
Description: A Kerberos Error Message was received: on logon session
 Client Time:  Server Time: 15:26:50.0000 12/2/2008 Z
 Error Code: 0x7  KDC_ERR_S_PRINCIPAL_UNKNOWN
Extended Error:
Client Realm:
Client Name:
Server Realm: CORP.NTL-CITY.NET
Server Name: cifs/OHCLECFI1017
Target Name: cifs/OHCLECFI1017@CORP.NTL-CITY.NET
 Error Text:
 File: 9
 Line: ae0
 Error Data is in record data.
 
Everything I have read seems to indicate that I have incorrect spns registered or that I am missing an spn.Currently I the application lives at the following url: http://Ohcleiis102c.corp.ntl-city.net:81. I  have the following spns registered to the app pool identity service account.

setspn -l corpdmn\secm03c yields the following
    HTTP/ohcleiis102c
    Host/Ohcleiis102c.corp.ntl-city.net:81
    Host/ohcleiis102c:81
    HTTP/Ohcleiis102c.corp.ntl-city.net:81
    NCC/Ohcleiis102c.corp.ntl-city.net:81
    HTTP/ohcleiis102c:81
    NCC/ohcleiis102c:81

Where I am uncertain is to where do the spns need to be registered and how do I detrermine this. Any help or direction would be greatly appreciated.
 

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Asked On
2008-12-02 at 09:10:02ID23950364
Tags

0x7 KDC_ERR_S_PRINCIPAL_UNKNOWN

Topics

URL/URI Usage and Design

,

Microsoft Identity Integration Server

,

WebApplications

,

Miscellaneous Web Development

,

Windows 2003 Server

Participating Experts
1
Points
250
Comments
2

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Answers

 

by: jazzcatonePosted on 2008-12-02 at 14:10:16ID: 23081401

Update: The developers and myself decided to put the application on the default port 80. We then deleted all of the mentioned spn entries. We then re registered spns, so upon doing a setspn -a corpdmn\secm03c it now looks like this:

    HTTP/ohcleiis102c
    HTTP/Ohcleiis102c.corp.ntl-city.net
    NCC/ohcleiis102c
    NCC/Ohcleiis102c.corp.ntl-city.net

and the application lives at Ohcleiis102c.corp.ntl-city.net. The client is now able to authenticate ! I have done  lots and lots of reading on Kerberos and SPNs. I have to say I am not sure as to whether I understand why it did not work before while running on port 81 as long as we had spns registered there.(or if they would even need to be registered there!) If anybody can shed some light on this it would be greatly appreciated.

 

by: henjoh09Posted on 2008-12-10 at 04:09:24ID: 23138079

cifs is the host SPN and shall be computername with and without DNS-suffix, but without the port number.
Use 'setspn -R <servername>' to re-register HOST-SPN.

20120131-EE-VQP-002

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